1、BS ISO15786:2008ICS 01.100.20NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDTechnical drawings Simplifiedrepresentation anddimensioning of holesThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 31 May 2009 BSI
2、 2009ISBN 978 0 580 53497 3Amendments/corrigenda issued since publicationDate CommentsBS ISO 15786:2008National forewordThis British Standard is the UK implementation of ISO 15786:2008.The UK participation in its preparation was entrusted to TechnicalCommittee TDW/4, Technical product realization (T
3、PR).A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom
4、 legal obligations.BS ISO 15786:2008Reference numberISO 15786:2008(E)ISO 2008INTERNATIONAL STANDARD ISO15786First edition2008-10-01Technical drawings Simplified representation and dimensioning of holesDessins techniques Reprsentation et cotation simplifies des trous BS ISO 15786:2008ISO 15786:2008(E
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8、RIGHT PROTECTED DOCUMENT ISO 2008 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below
9、 or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2008 All rights reservedBS ISO 15786:2008ISO 15786:2008(E) ISO 2008 All ri
10、ghts reserved iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 2 4 Methods of representation and dimensioning of holes 2 4.1 Complete representation and complete dimensioning of holes 2 4.2 Complete representation and simplified dimensioning
11、 of holes. 2 4.3 Simplified representation and simplified dimensioning of holes 2 4.4 Representation of holes on the same drawing 2 5 Structure of dimensioning of holes 3 5.1 Structure and sequence of descriptive elements for simplified dimensioning of holes 3 5.2 Graphical symbols 4 5.3 Number of g
12、roups of holes and number of holes in a group. 6 5.4 Indication of tolerances 7 5.5 Hole bottom . 7 5.6 Countersinks and chamfers 7 5.7 Depth dimensions. 8 5.8 Indication of surface texture 10 5.9 Indication of dimensions on geometrical tolerances 12 Annex A (informative) Examples for representation
13、 and dimensioning of holes, counterbores and internal threads . 13 Bibliography . 18 BS ISO 15786:2008ISO 15786:2008(E) iv ISO 2008 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The wor
14、k of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governme
15、ntal, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The m
16、ain task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. A
17、ttention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 15786 was prepared by Technical Committee ISO/TC 10, Technical product documentation, Subcommittee
18、 SC 6, Mechanical engineering documentation. BS ISO 15786:2008ISO 15786:2008(E) ISO 2008 All rights reserved vIntroduction This International Standard has been established to specify the simplified representation and dimensioning of holes. The rules established by this International Standard determi
19、ne, unambiguously, methods for the representation both complete and simplified and the dimensioning of holes, as well as the structure and sequence of the descriptive elements for the simplified representation of holes. BS ISO 15786:2008BS ISO 15786:2008INTERNATIONAL STANDARD ISO 15786:2008(E) ISO 2
20、008 All rights reserved 1Technical drawings Simplified representation and dimensioning of holes 1 Scope This International Standard specifies rules for the simplified representation, dimensioning and tolerancing of holes, counterbores, internal threads and chamfers on drawings. Where there could be
21、misinterpretation using simplified representation, the complete representation and dimensioning by cuts, sections or elements on a larger scale apply, according to ISO 128-30, ISO 128-34, ISO 128-40, ISO 128-44, ISO 128-50, ISO 129-1 and ISO 406. 2 Normative references The following referenced docum
22、ents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 128-22, Technical drawings General principles of presentation Part 22: Basi
23、c conventions and applications for leader lines and reference lines ISO 128-30, Technical drawings General principles of presentation Part 30: Basic conventions for views ISO 128-34, Technical drawings General principles of presentation Part 34: Views on mechanical engineering drawings ISO 128-40, T
24、echnical drawings General principles of presentation Part 40: Basic conventions for cuts and sections ISO 128-44, Technical drawings General principles of presentation Part 44: Sections on mechanical engineering drawings ISO 128-50, Technical drawings General principles of presentation Part 50: Basi
25、c conventions for representing areas on cuts and sections ISO 129-1, Technical drawings Indication of dimensions and tolerances Part 1: General principles ISO 406, Technical drawings Tolerancing of linear and angular dimensions ISO 1101, Geometrical Product Specifications (GPS) Geometrical toleranci
26、ng Tolerances of form, orientation, location and run-out ISO 1302, Geometrical Product Specifications (GPS) Indication of surface texture in technical product documentation ISO 5458, Geometrical Product Specifications (GPS) Geometrical tolerancing Positional tolerancing ISO 6410-3:1993, Technical dr
27、awings Screw threads and threaded parts Part 3: Simplified representation BS ISO 15786:2008ISO 15786:2008(E) 2 ISO 2008 All rights reserved3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 complete representation of holes representation of hole
28、s in accordance with generally valid rules and projection methods for technical drawings 3.2 simplified representation of holes representation of holes, drawn either true to scale or not, with a symbolic representation of the features 3.3 complete dimensioning of holes dimensioning of holes using di
29、mension lines and extension lines 3.4 simplified dimensioning of holes dimensioning of holes using leader lines and reference lines 4 Methods of representation and dimensioning of holes 4.1 Complete representation and complete dimensioning of holes The complete representation and dimensioning of hol
30、es according to ISO 128-30, ISO 128-34, ISO 128-40, ISO 128-44, ISO 128-50 and ISO 129-1 applies in all cases where a simplified representation of holes and dimensioning could lead to misinterpretation of the drawing (see Table 1). 4.2 Complete representation and simplified dimensioning of holes Rep
31、resentation and dimensioning of holes in the sections is preferred. For dimensioning in the sections, the leader line is directed towards the point of intersections of the visible edge of the part and the centre line of the hole, ending with an arrowhead on the centre line of the hole. For dimension
32、ing in the view from above, the leader line is directed towards the centre of the hole, ending with an arrowhead on the outline of the hole (see Table 1). For rules relative to the use of leader lines and reference lines, see ISO 128-22. 4.3 Simplified representation and simplified dimensioning of h
33、oles For simplified representation and simplified dimensioning of holes, only the centre lines of the holes are shown. In the case of the view from above, the location of the centre of the hole is represented by a cross using continuous wide lines (according to ISO 128-24:1999, type 01.2). The locat
34、ion of holes represented parallel to the plane of projection is shown by a long-dashed dotted narrow line (according to ISO 128-24:1999, type 04.1). In the case of simplified dimensioning, the leader line ends with an arrowhead at the centre of the hole or at the point of intersection of the visible
35、 edge of the part and the centre line of the hole. The arrowhead points to the surface of the part from which the features are indicated (direction of manufacture; exception, see 5.3) (see Table 1). 4.4 Representation of holes on the same drawing It is suggested that holes should be drawn and repres
36、ented using only one of the methods of Table 1 to avoid causing confusion on the same drawing. BS ISO 15786:2008ISO 15786:2008(E) ISO 2008 All rights reserved 3Table 1 Comparison of methods for representation and dimensioning of holes Complete representation and complete dimensioning according to IS
37、O 129-1 Complete representation and simplified dimensioning Simplified representation and simplified dimensioning 5 Structure of dimensioning of holes 5.1 Structure and sequence of descriptive elements for simplified dimensioning of holes The structure of the simplified dimensioning of holes is comp
38、osed of continuous enumeration and denominations of features used. This means that the graphical symbols (e.g. ) and the dimensions (e.g. diameter, hole depths, tolerances) are shown one below the other. The feature with the largest dimension shall be shown in the first line. The data shall be marke
39、d in characters of the same size, with the exception of the indication of surface texture (see 5.8). The necessary data for each feature, several identical features or several groups of identical features are indicated on one line of the simplified dimensioning. Structure and sequence of data is exp
40、lained in Figure 1. BS ISO 15786:2008ISO 15786:2008(E) 4 ISO 2008 All rights reservedFigure 1 Structure and sequence of descriptive elements Figure 2 Indication on a drawing 5.2 Graphical symbols See Table 2. Table 2 Symbols No. Symbol Term Example Figure 1 Diameter (ISO 129-1) 10 4, 5, 6, 7, 8 2 Sq
41、uare (ISO 129-1) 20 Table A.1, No. 63 Sign between nominal size and depth or angle dimensions, number of features and of groups of features M10 25 4, 5, 7, 8, 14 4 / Sign between depth dimensions or between number of groups and number of features, e.g. thread length and bottom hole depth M10 25/30 9
42、, 12 5 U Cylindrical counterbore, flat hole bottom 10 25U 3, 4 6 V Material-dependent bit (point angle of hole bottom) 10 25V 6 7 W Indexable insert bit (hole bottom) 10 25W 5 8 Y Dimension indicated up to bit 10 28Y 8 BS ISO 15786:2008ISO 15786:2008(E) ISO 2008 All rights reserved 5a) Complete repr
43、esentation and complete dimensioning b) Complete representation and simplified dimensioning c) Simplified representation and simplified dimensioning Figure 3 Hole with counterbore a) Complete representation and complete dimensioning b) Complete representation and simplified dimensioning c) Simplifie
44、d representation and simplified dimensioning Figure 4 Hole with flat hole bottom a) Complete representation and complete dimensioning b) Complete representation and simplified dimensioning c) Simplified representation and simplified dimensioning Figure 5 Hole with bottom produced using indexable ins
45、ert a) Complete representation and complete dimensioning b) Complete representation and simplified dimensioning c) Simplified representation and simplified dimensioning Figure 6 Hole with dimension to point angle of hole bottom BS ISO 15786:2008ISO 15786:2008(E) 6 ISO 2008 All rights reserveda) Comp
46、lete representation and complete dimensioning b) Complete representation and simplified dimensioning c) Simplified representation and simplified dimensioning Figure 7 Chamfered hole (hole bottom not specified) a) Complete representation and complete dimensioning b) Complete representation and simpli
47、fied dimensioning c) Simplified representation and simplified dimensioning Figure 8 Hole with dimension indicated up to bit 5.3 Number of groups of holes and number of holes in a group Groups of identical holes (counterbores and bores) shall be dimensioned and toleranced with a single instruction. F
48、or the repeated groups of holes, only those dimensions necessary to identify their location shall be indicated. The number of groups of holes and number of holes in each group shall precede the largest diameter of profile. The number of groups of holes in a group shall precede, and be separated from
49、, the data by the sign “”, e.g. 5 10 or 6 M10. The number of holes in a group shall precede, and be separated from, the number of holes in each group by the sign “” and a slash “/”, e.g. 3/ 5 10 or 4/ 6 M10 (see Figure 9). Where ambiguity could occur, group and element description in words may be used, e.g. 3 groups/5 holes 10 or 4 groups/6 threads M10. Text descriptions shall not be used in drawings subject to
